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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202b1910e0ce7f61bf1789bbb12c4e6f418aee36fffce5cc18e1bf43878f312d' 
  AND token = 'HqN1Ppw6qu564bwjDbPUDWBXNlNQsWARV/Z9FZ7J/I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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