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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ce247f0a21129a2c3c6a62def65fe4a6a7894dafd1af7164761afc0ebfccf2' 
  AND token = 'lrhD6qB28fk1810Xy3NSmWkyrdwjqd08zU01/tO1olo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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