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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9530b625e0cc1b98d0d50d7683e097388517b77b0c2fa6f5d215a07f009113e' 
  AND token = '4IDq93aW/upKbqNht3S2NIiLVYUfPKJTnbNj+4psAE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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