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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea55f2544ed84ecfac9e37d5e0ce9ebc7efc82f38747139ed4626ab9a29223c3' 
  AND token = 'Jd8ZsaoDL9UUmafoGmN6fOla2jQXx7YXSKulKykE2tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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