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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca7d51c053da5655dfd8870ad30bd3b4cd8d3767b43937e81ccd13517799830' 
  AND token = 'AyEWBqUiA65AAKETZq8oHGxMT6Zv7HLplQkKGR/D0Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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