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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf01ee10a5e74bc9fa5f829738e73558e392311a8c447644ae14d478b0a8f40c' 
  AND token = 'mHeZovyNHSDeYR1GIwL440AHSX+LOCiQ7163jJlcDDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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