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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92605b8ddc9750ee97132a08dd6d3dda387ef186be1559e098b34cf87f1f2d4' 
  AND token = 'EH0l53PGK4Gce4cnL2N91JmqXXjYGFYzGW3wIH1y3p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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