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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a731cfa6f25bc0dea7f65c9bd2e376c29be20e4df822ba808b483c69bc4b2e' 
  AND token = 'TTz4I7MdqAjH3V2k4cbm5OLSyu/4gONuMDvVVQ6fqSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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