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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ac3db9f949a7943207f75188fa143d139b3b29ea4de1259c99ebb7e6f3ea9e' 
  AND token = 'YpEmaQE8Ty7jAeaEvlJwtoCj/8ObFs+4ezXvVufEYU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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