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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98d45c6d7020d41549315b00b02535862dbc1d1b248929826ac781e06a00520' 
  AND token = 'ejjomNgoM2PXUqFz7xxHyVw7n2CC3w2jphwnK8ons4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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