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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019a266b64869a9a38e81fc263d1c0d30cd6eadd1567b6398aa3d28b69edb68a' 
  AND token = 'K2JhfJ8txDM/xQ6zImh2fMiMXcJwY7u+Gof511PaZIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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