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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0738e9ec94ab14797f33e756429ed91f22084c309def9b31d3feb60579188e45' 
  AND token = 'j7yEBHf8WbnjEIntJTda8m5WAEk61Mm7Hn7+J3AoVqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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