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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f01084550e475bcd44fc7f7b892ccc8efe89a114150803ec59763f5a24a0e6' 
  AND token = 'FePjmVZFpHKpRs+WK1+3eWtH7MhOX1UJsXO3uQyx63E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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