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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ac3b2cc0a1e2c1db436bce9f3c2c50d92d1334ab1a7e0df4ac5a070fbd5b3b' 
  AND token = 'JLU2StkAED38YNL5CnRWRh1YUfYGW27MeAiU4KUVZZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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