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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcf60a3bd76dd3b01db8bf3d91cffc7d20266229ce0257bd36dcfb9219fcf781' 
  AND token = 'amShdkfvFO06gUTgUKi4o/pepuaxR7icPoHg1bPF+pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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