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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e4f603a0238de5aa6e3fac38d5961b6c531c2ee912a4b281d1932de28f36cf' 
  AND token = '9sRlm0Am0rEPR0livcHyZG4lNAmKhqu7HU/sntqaFYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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