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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56df749fba36a0cb3814b9b0e4ee81e77926643e5dcdc55f0a36381c03f5b5fe' 
  AND token = 'TwC1lzmvr/Ua/X0r5Y4R9TWzV/fOV3uRihfe8OCZ6nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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