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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cf0be25d1b911fa1f9c3b50854364d3f44308a940bd94e59d5419a5a51b1ba1' 
  AND token = 'O3wo4CNi+rH0XdjkeL7pmx2HjIIK/IJfmym3wdz/3cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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