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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b99f37e058e15cacd52587b61b7467ed637f17243bc601f8369b9cb6d1522180' 
  AND token = 'gdCZ40fIUVyF3RlFdew9oG35VcatxCDR355UA41Sxlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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