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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa621a07b72eae3349614bd1b93b5e98932dc35875980270eba5fa119b988a21' 
  AND token = 'JZPzclo3AmkzgqFQ32m9V0Ld3K1+nHOWYY2STBwF8cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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