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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4d527ad2bf99bdde9a0ca2467be5111425ca8dc9b2d01d6bb9e3c20fa4f71e' 
  AND token = 'erIK7rZqUHj9RUur7uNheB88iqp51ZD2FkvJuQS0McQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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