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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7462a0d5a9282d3595593b983807799a995a583ec4b4ed2559de0eeb6e5be88a' 
  AND token = '/DTMvJzR7Qra0UF8tFQP48tQToaRoWuhv1eDpCmiiD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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