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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d3628390d05d7f549c57d2958841476871a48b2455f40cc73bd74b38f833274' 
  AND token = 'CM91f0eb/3sl15KBmpYrCIKOla2JWTsd1c/7gyxmU+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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