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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ea050981c15d273f3e8e3d250e2a6965d96bab0eaecdc21a7f1feb001d2ceb' 
  AND token = 'Fhc1/xkAuUKLC7wIaLCViBY0WtIcAry8uAZj467/Bdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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