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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8826d763a5b77d3bbc1d3e865b7464ef5611ba2a619def6365d6abdaeab636af' 
  AND token = 'Ktq+NkGJfHdJXmbM3+EpeFJ2J16XdSRq4mOcvq9p1J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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