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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed15572278f8c5d7d7d572cf4add8ce2b1c6384b7a679243a1c632d2e7b73eff' 
  AND token = 'JEoFdNdrKr5QV7Ca4Rc7X0VCPYOTvRP+URZ6SF9UyHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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