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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb549f32fc22b01fed9b381aa06c7d6d63811965741e121d65ddc35e5e4007a' 
  AND token = 'G2eZh7W86ej3ONJjxfrTe3/CfQuzyXQD4LLFFSylg4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}