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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d15d3d5ef38ddc69be22d8a646d6619538805f357b1a69f4241ff35674d686' 
  AND token = 'LiS/NhVD0n3GBP57rT34MjZw89DEqBbW26UzQL8m09M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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