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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a48fefe5168dfbc21189a1ad59fcb9d999341f7eb735450e7f19233c282146dc' 
  AND token = '2yMW8lCXrqnx0qb249Sajoy4NzsYXQk6gsIIlSz30Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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