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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3efcbbac66fb13e13945b49c61d4cc91daac05839408042e16c5ccfdbca834ad' 
  AND token = 'fa6tSNVP8NShWni5TBU2t/59bzyh2V4gAf9HVbidS30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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