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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55c1789dc3be23db517236c927d4f4c91c5605cc46c301c96c69e522ee707f4' 
  AND token = 'BbMc+ekVX+mtgy77U3fYsMwegQ4o2d33QKJ6prAX+4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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