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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63959eb4b903dd90e556284c9831449d840387e89237c791ae2e7328cf540845' 
  AND token = 'MVy0kJHewthKUccU8AbxF0CLkOqF+stN5w/mqjkzuho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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