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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e26fdd8866899e7a07b67d019d0a1b406ca6f2ce970fdfa1b4a5034dc5ae5701' 
  AND token = '9dy/F+WD9tURFnWK/QHoylM3Af9UukN/y+bc5fmEI4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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