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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94162cbbc16f4c2bc4d1c98430cc4fe0973a2fe4e8f30b385e510b1e74cd56be' 
  AND token = 'AnI3D/ga/q3vDpzjqlFr49VYSISJUXP1YsRo2EgUJUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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