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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb33968c6c95c968a793beb790b6adaf21b7fbf247714f51fcf04ffa31349e4' 
  AND token = 'rjFU1+tWebJWOQkKVRnoozzjWmHgJoD4te80PLTGsb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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