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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56802ef3aed31cc586e956163762f8292d699b3e1aad15df5445cdfc82278156' 
  AND token = 'qOBiqtmXZ3gJdm+1Hey3MicGMxj3KEYoiHkRMJYfsPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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