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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031da9dbaf8803aa956ae98dab3eb08ec171f42825ffc9cf798e33a4f9f1d980' 
  AND token = 'H2GHPDQw4BVrdoHcMyxA3S9YkfIkYeSRi5CR3D3kwSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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