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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25bfaed95c8c835d8d0b32cd756b35cfd2b4de97bcc084191555341ec6afba01' 
  AND token = 'GK7Gi2ZBnKKnvKfWCL1ttqpK0/A7hb3ZrQkFDqwNM1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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