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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e84e803641ce4e01b8a826240b98f70e7b8755815bcd45b6130a095c2ecc86b' 
  AND token = '+hG7xEqizSW5EMA5TPSx0hw0oXLdyzbXGcxZrg38pko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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