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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7df128c1b901213b580b66459a7b0e6875bc239a2e03de84189bf540a9615e' 
  AND token = '2AeriHDmiJS37JwviL7Ns2zkwtNPSUH4+DIhDs3o6Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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