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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba2c375c3339fed508d9f4c4910638b768b4dfc0657fc944b27428b54851b98' 
  AND token = 'syRjejPwrp833bS9rQMq0Ye2Ieqq2+f3v1cA013oum4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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