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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51dff0cd950e77fccaa36d30bfdbec66cba870ed540ed1d438d8ce292e8c3d7e' 
  AND token = '1cmqto+gy3G/97lLsxBRaGJfHR90xJcujWOKkW24hHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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