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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9279e0790ff9e9877002fc3ade8a64ae854d252aa9e4664ce7934ba2e73e091b' 
  AND token = 'yPhnn1DH8b3R7Zl9E8bhSzaoXYWmgJLRKbJ2Zyg9aA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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