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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29629e8a7381cf54b57d7fe03afdc21f21ca22e3a2266a87917419b9b8d67a83' 
  AND token = 'NjbUuNrk781IyvyaRX3mNG8/wJbOUsTghWjr8lvZAhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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