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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42c30becd473f4d7e4f68b84b96a81acdff32a4dd22efdd740bd017d5ab977a0' 
  AND token = 'oQHbgpWeKsDyMb6zW3r0BH1qdyYlobQU2FKpC4cc4Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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