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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08cb03a8c7ad92bb6b99e2e83de5fef997e3ac7c7bf51c9372eb979252128559' 
  AND token = 'K1DsdpNB+oFcQ5C1p6f9eLaVEIJeY7l3BU5xIVgpuEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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