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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db695f46272f724dbc549d7998f3a9dd2eb2eeb276295a7fa742659b227709d' 
  AND token = '4OtAwWl+6uJ+Vh1z9QkkfGV3ObO6y4ZxQ5H/i3RXj9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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