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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17190a226230ee6e4a67531212c76d033afa016d4788439dc890b2794fbd41a' 
  AND token = 'jbkDpHERHuQ+Wi0bx3rdt/5Cnk24sCQO0uUTgawL0Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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