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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c10112fbe692ec3e5dc18193c55b1fb9652f9d7323ea8f9d9e00119e9aceca9a' 
  AND token = 'H07c4vbfgQLh/YH8mjV6jbvMaVJLjsg55b7UakMukws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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