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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c1cdfda49731dcecb5b145978f474d679b5a5cf0c2f9f84a883782212cd07a' 
  AND token = '4MsNXptIdcxLtZcKWGQbDXTANPH1AdfFHMfZ8qGb+r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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