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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7430d9d5999109490d037dd829437f4e84329718f749f7d4ffc4e418edf50fe' 
  AND token = 'gnp3OasSsO/m9PtGa6JRP9q9tlVH8EcjEljr70VWFiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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