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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4e540e7f8afbf2f9791ca0e70f1432d583003d47e1418447269c314f75357f' 
  AND token = 'C3kz6zaPnbyGTkzy5Yt/SgBawswjuyeob0YgU3jKQqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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