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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a6e2f84a76d1becc5cb4ac324e0270ed5af46577f6f6a990dba1f88563fd2c' 
  AND token = 'LNGlfNDC/fKD9F8Sl3wvcAL3wMOBe9l3QdY4bpwJ/r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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