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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192b087aadfae56b1ab835f425f1f0a4133cc310f2e62d1f633990ea27c6719c' 
  AND token = 'xW0l/0R7QDnROpoHR/stabVRWQd5xoPyFisKXPqrX4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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