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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b810e574518446c46afdd60ad70b8619fcde1dcdbce49949019c6571c9e4cf' 
  AND token = 'tgmT4D2Inl8Lsb7B/gY23v9Br/NhKxn0+yCGLRjBvYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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