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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c315313ab01107e9585b5d5d39db6d74bac869f088acb44364d254b35dfc796e' 
  AND token = 'w9XLK/0A4dMAxzR2VyhtxDB5NCBfLb0dnxn9t1pz8no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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