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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce66ae9dca768a38592e86a1b33370207fd7751cd1bf686fc9d82ed406b60dfc' 
  AND token = 'rRrjd3+AXpWQgVxDedSeXeTlQ0ULg5juBRRaO0wVqPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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