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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f06d68f675ccc6141a6801531377ecb20e6e3a8ec62529b9050d839ae31190' 
  AND token = 'hPQ9aSWWlfc3fHT2rASXDtAJQ3wrSGBLIS8R+YkLWeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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