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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d0cb656ddc64ac5a1aac628032ed4e6460e4ee066232793e006ddae4731e956' 
  AND token = 'Jucuw7q2ch9J5s7iG0g/ZQ3xEbuOlrR1qFMow1S0Oa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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