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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '966b5dfefbfcf42a98bc8f66dda2b5c17c26991b4c61e187bad4c89f710b99cb' 
  AND token = 'BMl6cgFlgAo3LPc69D7RWy/Wm39q6p15YllW9w/BXZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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