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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eb84f720b157af252d1abebc3a03478e9b05c2fcf2439f60aa4ee3571c56c86' 
  AND token = '4EGf42BFHvHN8eTMJys9e3noetc9xREIi5tRlgm+8p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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