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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d28f43f040fd169cf863ac9bd4e4707de5c109f36d9bd8471f7a0c7682836a9' 
  AND token = 'Jc+e0TOtAribc0czlbPk3gh4+h/LY+8PguuhubgaH60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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