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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beda1f8d93a52176ea46495fb59c751943e6c2b596a4982852d26f8efa853336' 
  AND token = 'k6Ei/0CYISd/d0DsFnrg6TOMC/jFXS8fh2M90NoRKHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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