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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27a669b89414e20f2e9c728872022336b94dac77e7f2d5fedb3da334b234e998' 
  AND token = 'qrJbiz/hj4FH1q364IxLOzGDiGv2Iw4aZ9WDG5wdlkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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