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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4852bf6e71ebdb95d110f72edbe0cc2b0fe1c6b32e9a75b207579fb09f59156b' 
  AND token = '0N+CKDt2eykpvu6YlLPBAy5EZtC2Ro9o0eG0BROiCRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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